Speaker Asylum: Re: From another posterabout the B&W 700 series design flaws... by John Ashman General speaker questions for audio and home theater.

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Posted by John Ashman (D ) on December 5, 2004 at 20:27:27

In Reply to: Re: From another posterabout the B&W 700 series design flaws... posted by theaudiohobby on December 5, 2004 at 15:15:48:

Really? Where exactly IS the "new" breakup mode in B&W's kevlar? At almost any crossover rate, starting at 4K, it will be audible. In fact, at 12dB/octave, listening at 90dB, the midrange will be putting out 78dB at8K and 66dB at 16K. IOW, no matter where the breakup mode is, it will be audible due to the poor crossover choice. The SIMPLE, COMMON SENSE solution is to put in a decent tweeter and run a 24dB/octave crossover at 2.5KHz +/-. That would also substantially improve dispersion, something at which the B&Ws are pretty poor. And the high tensile strenght of Kevlar would act terribly against the FST design because it would force cone movement to be converted to cone resonances. Any decent tweeter could be crossed over at 2.5kHz, especially with a 24dB/octave crossover, so there's no excuse EXCEPT that people hear the breakup mode and think it's "detail". Also, you should now that FST design would automatically suck at frequencies much lower than, say, 500 Hz. And regular Kevlar implementations suck pretty badly by 250Hz and down. Bad design is still bad design, no matter how you try to gloss over it.

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